ARRI Rosettes & Pins vs. Tripod Threads
Comparing 2 standards across 12 specifications. 12 key differences identified.
The ARRI Rosette (31.8 mm diameter with 60 radial teeth and an M6 central thread) and ARRI 3/8"-16 Anti-Twist Locating Pins (dual 3.0 mm indexing holes flanking a 3/8"-16 screw) are the de facto cinema rigging standards developed by Arnold & Richter Cine Technik (ARRI) to prevent camera cage accessories from twisting under heavy rotational torque.
ISO 1222 defines the standard mechanical screw threads used to mount photographic cameras, lighting accessories, and tripod heads. Standardizing on imperial UNC threads: 1/4"-20 UNC for camera baseplates and accessory cold shoes, and 3/8"-16 UNC for heavy tripod apex bases, fluid heads, and professional microphone boom poles.
Specification Comparison Table
12 Parameters| Parameter / Spec | ||
|---|---|---|
|
ARRI Rosette Outer Diameter
|
31.8 mm (1.25 in) | — |
|
Tooth Configuration
|
60 radial interlocking teeth (enables precise 6.0° rotational index adjustments) | — |
|
Rosette Center Bolt
|
M6 × 1.0 mm internal metric thread (or 1/4"-20 on some consumer cages) | — |
|
ARRI 3/8"-16 Anti-Twist Pattern
|
Central 3/8"-16 screw flanked by two 3.0 mm locating pin holes at 15.0 mm spacing | — |
|
Primary Applications
|
Cinema handgrips (ARRI Alexa, RED, Sony Venice, FX9), extension arms, heavy top handles, monitor arms | — |
|
Torque Resistance
|
Highly resistant to rotational slippage when properly seated, since the teeth physically mesh together rather than relying on friction alone | — |
|
Standard Camera Base Thread
|
— | 1/4"-20 UNC (1/4 inch diameter, 20 threads per inch, 60° Unified Coarse thread) |
|
Standard Tripod Head Base Thread
|
— | 3/8"-16 UNC (3/8 inch diameter, 16 threads per inch) |
|
Camera Female Socket Depth
|
— | Minimum 5.5 mm to 6.5 mm thread depth in camera base |
|
Male Screw Thread Length
|
— | Standard 4.5 mm to 5.0 mm threaded protrusion (prevents bottoming out against internal sensor chassis) |
|
Reducer Bushing Adapter
|
— | Brass/steel 3/8"-16 to 1/4"-20 slotted reducer bushing (converts 3/8" sockets to 1/4" studs) |
|
Domain Ubiquity
|
— | Universal across all DSLR/mirrorless camera bases, tripod quick-release plates, gimbal studs, monitor arms |